#include<stdio.h>
int main(){
	int n;
	int count=0;
	scanf("%d",&n);
	while(n!=1)
	{
		if(n%2==0){
			n=n/2;
		}else{
			n=(3*n+1)/2;
		}
		count++;
	}
	printf("%d",count);
	return 0;
}
